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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e91a4bf37cff8ce5f16720a39ade885f115c796c8b348d4306911a130cb8548' 
  AND token = 'mYAlgtBowI3fMQew52HDn/mK6ZcTQ5NIABKNxsHEH3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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