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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '129df2e8877436fe3a4fe6dad4c9393b0b01ba0c4b5588c42e400b3c5d77036c' 
  AND token = 'L9u66dJp148VdvzEgRS4bXwjWfZYZEyZKSmn264D/NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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