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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c98fc04a2b77c242ced8cb9c6c8474c5b25a7f11dd32e8125113bb7a97a3c0b' 
  AND token = '6UdeXr1tt0Ay5GjG2hG+70acs+DggIb5S4SttZVZb2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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