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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76604d24b3edbe0c279671a453abcbf2a3fb11d15b6a05e558bf48f0bc4a70e' 
  AND token = 'd5Lp8/w178Ms/03Gc0xQN1PlVKXUwNSZaMI7/3jpG4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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