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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab6f7f2bac13c53c6a804a64a16190d8152ef9caa2798834c67cb06fc25335e' 
  AND token = 'mr4zbWBz2ug7KJTiJ2s7R9dWghz5nL/Fu/WAE0HZNk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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