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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '726b00e77109451adf6469614a781f488353f0d26f67066620f32171ebcf7f42' 
  AND token = 'NhRjE/GSkGqj5dzYr4kckqRX4NOaESENTZDfi77V570=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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