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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7460aaf8b99cb09832c1cfdb1c93e07039377beb56d4a0e4ea0c04302aa26f7b' 
  AND token = 'SE0Fuy/kaYytIfyNyPTV0kDfiREoR9aXv2401a+SBwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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