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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f193e117f3dedecafdfc242627eb44528dd097ec4c762a326543c3478683ae' 
  AND token = 'LsuQu/lsA6+SR7E54aLncGhadIKryUCwyuA56Uh8/Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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