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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4337aa37717c7e49bc06e0e09cd51c786c244b6181de369207d77b77854eccce' 
  AND token = 'TY8RdsdnJlQcwycBAat2U9DL32Ebz5z+dc/Z+cOqLtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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