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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd505b748cebb00fbdbcc3b062d46f7b99e0f3a6cc5d142c6366ad5ebc26a4d1c' 
  AND token = '1T7v1F+gLU6o08+rOhL4QU9yuEUKyVDhDHgRq7R9Oek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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