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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b40678441c94b0be394aac250b6da46efeef5df7f9e43decaabbcc887d92d5' 
  AND token = 'ZAqfaqVB/A1Ap4g8W4XQTF25m7zxEpq2IhJ3ts/zZ+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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