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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7c1822db3b73aaff19eb9e764aee6b1b324a9108d8feb3c397dd9a0bab9b4a' 
  AND token = 'bu3fV8M0eUxnUFqNJtrH2p5KaD7y0sAMqv0rDTRIw5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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