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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a381bd35803f8ef609e58cfb5653f0201b8ab1a1e4818adb2e842d1ad57bead1' 
  AND token = 'hnS7jETeCN0xnhNuRWxT+xeoJ21GNDHyy0swN8S7zUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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