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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018676e60861d3cc9c6673b0502aa7d807c368463c2398da7c93a6aa1b2c1576' 
  AND token = 's4xwI9zK4d82eMq2Pkrjug2mYSCYskRcYlSC5Ao/DVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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