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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c061bb8d6de4132d04c2fbc7ae507b0cc75eb630ba95769c889fe79be203f370' 
  AND token = 'S/PUggcPAt879z6mPgwH8BEuRtCEN/IBi2Zgq4iFuvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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