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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6330d605701c68f6521efd1d5fb667113d043d9e35e80f2345fd7b4d20fa0721' 
  AND token = 'AwIHAIlfBYEe5MwtL63OffczIUXy4qJuD6hKFdqGt1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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