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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5803ca664ce4fbcf3e4b87b3adfa8b6dc8ed490e7d77b5249dd11527335e6177' 
  AND token = '+pC1A808RCtaSLoJP0Yj5WJa5t79B9ahBRZI5cULNhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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