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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91e10e88fa7a0e680e483ad4bf57de1e677733e8c9ac9c481fa6838e8bccde0' 
  AND token = 'u4qeAUhLd8RX3VOHkW8NYjzrYIscP30Y/QlsIxheOXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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