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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a584028f3a6d01a45ee74c1734eb49c52076d3f28d61ef20f3eaf9fc0f45220' 
  AND token = 'QRtcxmJQjDsS40xmNBOqWrkS6A832mHiyTKvYljJ9os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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