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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423000cc0b0da7912cb1608304679c7d1923700018aa8eeacc45c8fe2a63b6f4' 
  AND token = '8KC22GguCPQg5Vskvsw0ockc/p+aeUuI0djJJ5aZ5Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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