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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9903048ba010ba87d4cd3c41e9bea20893a23a966b3f3b2a3c6de16f4441621a' 
  AND token = 'P9YHRDBcVVQn5tcTNU1flUoa4eso7RFkFdTha9urmMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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