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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b4bc4b394880ac16a2ebd90de5a6e8017be8eacd36bafa7ae444514e224abb' 
  AND token = '+X0igrjqGKW1S5IfkpB+5ORbNNJN2FWgNpxJ/atx1l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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