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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92efe0a5cbfdf26bdeb75902e3abd3aec94c60f7f422cb2b318d3719262d191c' 
  AND token = 'nWTQUAB7Pgz5jTq8QuZgdvWb4pnM/odFs2AzlNEamO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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