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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2691258d0d5413e8172633c215003880319eea7068d410a276c8948e8b1a3d8' 
  AND token = 'IVbH6UFNhjCDBLREZ13tYJ8rBaKx2d9IVGCWZ8hwmd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}