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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb9042aac5a63c32a288e4b322015d27587b5a4eb256145ea17eea7842da413' 
  AND token = 'E0bvjD4/WV5c/vTd3gWQXYcsoeAGNfK5UYt8sfZ4LTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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