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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b877f2c91ac8aa7b1bf9bc69f3e958102f5517765e8611981fc578a8baa3f0' 
  AND token = '2dP8yl2jU0zIxRohM6xKDLPru3JpJ6xo4gqNQcgDLH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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