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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd82604069a768680a20621ba2ec49aa2ab976d02c01590850f8c787c5458dd' 
  AND token = 'hAp7bdRTMqRIfTKIAyhhFZC3U6k1wEoz3m1i5exbah8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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