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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebbe00a9cad878aad39effb2623dc03a21acd6bd5c5a938c8730463a5fed760' 
  AND token = 'IkIkdckWrFMMSTvpHM72JH9tLswr1A6LBL/y00UCTwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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