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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e542c690c890a4e41e7dd500c8faca5452497bdc75c7f98671da408f2b936d' 
  AND token = 'VU76IzefaZ7mLpMH9Slq/zL0dvB4eBnINyEf2KspR3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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