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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17b8b48858fde2d270ac4874756c77e35ab97e7790ef827ac0846af87003ec5' 
  AND token = '1nQ93AAaSJuWPLrUerpT08s/wfIO5LRN0iN3NhJ1bN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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