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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d642985cb23720e3431cd83d5c24f73667d750e8c3310501775e5f80d20441' 
  AND token = 'vteeFOL/vq5+AsvuzM9XVyO3C99L+Ct+u31ZH0myk3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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