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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babf857255b944bd1b12aaace281dc2ad1795f5eb1bc7418c25bc148b6f16d50' 
  AND token = '4Xr39DNSd4vleWgXpUIEhLy1xjMPgIK+zv/ZFFXL0zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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