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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27967bea2925c0b65610ea64e0b4a2c585012f74967eca0d7633f7d92f6020d1' 
  AND token = 'mzlni13px31Jnf5ud3PD9Xyn3YT1FO8Lx4d7msN2dfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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