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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6dba738f63b4f11e3ead68cd6088250f7df0dac093bb9681cd39b630a88ffe5' 
  AND token = 'qjqrdBcixBF+k/gnDQybQWI/DMNeVNAy6v/d81PONhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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