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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723931b32b6560069b51b49cd2e34c1e4c4bb5ec291ed53f4d3e77b82b8fa6eb' 
  AND token = 'qJ3+9nrjyhjKkFh/pjbdl3Ibzes3/5kv/nHeXPSpNzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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