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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e84ba0370e679998167b5de9d0f92cb1c7555965f0f92645fcaffa6513ab11' 
  AND token = 'HBUpDZSMFBnMvNd3f5riaSwcV4p0kQF/B7q6oEsV9ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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