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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fefc448dbb79745296ab29758cf23d38cc3101ac83aafe8559804ac77d0332a1' 
  AND token = '5BvAGOlcLY2WfGfKIqb8a+XEuZIHY+ux+Ep+flECeSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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