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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fc027a824738559263891fb37f3571586b4422e372451feabd69a0c64b632b' 
  AND token = '/suzWJ18I/BtCocFHjlqi/Ikdxq5De5MIJB6XcPdP2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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