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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '588ba13142ad22f2dd6aa58ad71a88c3811957a3ab2710bead55ac937c01bca8' 
  AND token = 'cdc43inGjCZ9zlcTBZSujiKIgkmwWjAn9soqgT0voIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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