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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a437547f51092b10696355ed13d8594a5efaac9ce76f50074ece90234c01aba3' 
  AND token = '12uwSVcxLtVHL5ZBcPMjjJ5c88jcPkJUiWdwrb9D0Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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