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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abab37437a941c01cd861a9af8323b9189679616254ed1fd6ef4aa1ca21211b5' 
  AND token = 'rOTZmbJ50gvvD1dRLx68K2ZMpn2a4SzQWy6Z/yGHe/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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