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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a40067f235f28228d843daa65479b3488c967d7f488094760a5473f41773d3' 
  AND token = 'aLSecdLKlMABqt9nOpzNXW6eW9m254lOPIzbWW9Dt68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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