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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa546f99a54e16638b81e6e9933df9610ee7056e17f9b001095aa6c0a8cdeab' 
  AND token = 'C9yrEDT2nmrx1uiaG1Veplbh6s522UgMPfdcqLPut8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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