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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2dc1ae134a000987465d2a6569ed04d678b125be7650034dbd6d4ad6808f9dc' 
  AND token = 'coAWfpQVI1d4wVeuY08GhAWmoVEJ8kfso6ckpGWg2Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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