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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c72c07465d33b06ad5988592813c2bec82529ecd81885306d6f87dfab5ab80' 
  AND token = 'WXgXLUfWB9xqrenNlb025ZormeNqR9C5KOCNnx4dz4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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