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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb26798411c97d0658e7816ed2b6364614acd743ff9e71ac29ae77181c32978e' 
  AND token = 'vc2v3AHBYmSDN0bBlp900S8EUSd+khYaJAYxH2+X/Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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