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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4652fc8322d8ef2bba14ce24d2234511e3146b7b76d2d79883fa5cd35261007' 
  AND token = 'Cng0EWo+JIuNCtyQ1+CvGuauHx/Db/PyVc673E9vE2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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