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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70fd5c65d88d4dabe9c2ceebf326172448a55bed9ec66ac2dbebd2c68dab34b' 
  AND token = 'LRcYuFgoIR1LEXIEEWUu7t0DDv4QKTix4jXoWwoU2LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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