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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30785e671f3652c278c99e4423c11e078896a38748c333312a32afc8825186fc' 
  AND token = 'NucpAc7ClBDzyCFAMk/DYppcWG/BOe9Sh77Epd+6O44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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