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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de8beb270b6d71887a581fa60b32653c3d79535c31101ccc781dec82adb4977' 
  AND token = '3eHlfIyTbdyTacb+boWv2Mre+6JU+YcXlZbC97A3fkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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